G. MATTHIAE

The reaction pp → pX was studied at a centre-of-mass energy s = 540 GeV by measuring the momentum spectrum of the antiproton. Data are presented in the four-momentum transfer range 05 < −t < 1.2GeV2. The shape of the mass distribution of the system X shows a diffractive component as already observed at lower energies. The differential cross...

Proton-antiproton elastic scattering was measured at the center-of-mass energy s=546 GeV in the four-momentum transfer range 0.45⩽−⩽1.55GeV2. The shape of the t-distribution is quite different from that observed in proton-proton scattering at the ISR. Rather than a dip-bump structure, a kink is present at − ≈0.9GeV2 followed by a shoulder. The...

The proton-antiproton total cross section was measured at the CM energy √s = 546 GeV. The result is σtot = 61.9± 1.5 mb. The ratio of the elastic to the total cross section is σeℓ/σtot = 0.215±0.005. A comparison to the lower energy data shows that the increase of the total cross section with energy is very close to a log2s behaviour.

Proton-antiproton elastic scattering was measured at the CM energy √s = 546 GeV in the four-momentum transfer range 0.03<−t<0.32GeV2 For −<0.15GeV2 the data are well described by a simple exponential form exp(bt) with slope parameter b=15.2±0.2GeV−2. This value is significantly larger than the one measured in the region 0.21<−t<0.50 GeV2.

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